UPDATE:
I have found ice, which goes in the very first missing slot between snow and sand brick.

I have found lava, which goes in the empty space before doors.

I looked around in the wwuonky wiki and discovered saplings(which are in the front part of the bag), so I collected the light and dark ones, but I can’t seem to find any pink trees. Are they in a different world? Are they some strange tree cross-breed? Also, are some of the missing spaces other parts of trees? leaves? trunks? Are there other enemy drops? hm…

UPDATE:
Evidence goes to show that pink trees and, complying, pink saplings aren’t in survival yet. Probably going to be in Fantasia.
I crafted Diamond Block and Stone Brick, and they’re in blocks. (Duh)
Still plenty of empty slots!!!